使用Crashlytics错误日志修复崩溃
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我从Crashlytics获得了一个错误日志,内容如下:
Crashed: NSOperationQueue 0x1d003d5a0 (QOS: UNSPECIFIED)
0 (App Name) 0x100710fa4 specialized ViewController.(getHistoricalData(url : String, currency : String) -> ()).(closure #1) (ViewController.swift:1324)
1 (App Name) 0x1007029f8 ViewController.(getHistoricalData(url : String, currency : String) -> ()).(closure #1) (ViewController.swift)
2 (App Name) 0x100712178 partial apply for ViewController.(getHistoricalData(url : String, currency : String) -> ()).(closure #1) (ViewController.swift)
3 (App Name) 0x1006fd448 @callee_owned (@owned Data?, @owned URLResponse?, @owned Error?) -> ()NSData?NSData (ViewController.swift)
4 CFNetwork 0x181fd1d68 __75-[__NSURLSessionLocal taskForClass:request:uploadFile:bodyData:completion:]_block_invoke + 32
5 CFNetwork 0x181fea6bc __49-[__NSCFLocalSessionTask _task_onqueue_didFinish]_block_invoke + 152
6 Foundation 0x18241dba0 __NSBLOCKOPERATION_IS_CALLING_OUT_TO_A_BLOCK__ + 16
7 Foundation 0x18235d894 -[NSBlockOperation main] + 72
8 Foundation 0x18234d4c4 -[__NSOperationInternal _start:] + 848
9 libdispatch.dylib 0x1813c6a14 _dispatch_client_callout + 16
10 libdispatch.dylib 0x1814029c4 _dispatch_block_invoke_direct$VARIANT$armv81 + 280
11 libdispatch.dylib 0x1813c6a14 _dispatch_client_callout + 16
12 libdispatch.dylib 0x1814029c4 _dispatch_block_invoke_direct$VARIANT$armv81 + 280
13 libdispatch.dylib 0x181402878 dispatch_block_perform$VARIANT$armv81 + 104
14 Foundation 0x18241f878 __NSOQSchedule_f + 376
15 libdispatch.dylib 0x1813c6a14 _dispatch_client_callout + 16
16 libdispatch.dylib 0x181403640 _dispatch_continuation_pop$VARIANT$armv81 + 420
17 libdispatch.dylib 0x181401fe8 _dispatch_async_redirect_invoke$VARIANT$armv81 + 596
18 libdispatch.dylib 0x1814082a4 _dispatch_root_queue_drain + 568
19 libdispatch.dylib 0x181408008 _dispatch_worker_thread3 + 112
20 libsystem_pthread.dylib 0x18166f06c _pthread_wqthread + 1268
21 libsystem_pthread.dylib 0x18166eb6c start_wqthread + 4
其中(App Name)
对应我应用程序的名称。据我所知,错误发生在ViewController.swift的第1324行,在函数getHistoricalData(url : String, currency : String)
中。功能如下:
func getHistoricalData(url: String, currency: String){
var Currenturl = NSURL(string: url)
if Reachability.isConnectedToNetwork() {
URLSession.shared.dataTask(with: (Currenturl as URL?)!, completionHandler: {(data, response, error) -> Void in
let jsonObj = try? JSONSerialization.jsonObject(with: data!, options: .allowFragments) as! NSDictionary
if let jsonObj = jsonObj {
// do some stuff
}
}).resume()
}
}
第1324行对应于let jsonObj = try? JSONSerialization.jsonObject(with: data!, options: .allowFragments) as! NSDictionary
我已经尝试了一些不同的解开jsonObj
的方法来试图阻止这次崩溃。最初我有像if let jsonObj = try? JSONSerialization.jsonObject(with: data!, options: .allowFragments) as? NSDictionary {
这样的东西,但同样的问题正在发生。
这与我解开的方式有关吗?任何想法/指针将不胜感激!
如果错误在let jsonObj = try? JSONSerialization.jsonObject(with: data!, options: .allowFragments) as! NSDictionary
中,则有两个明显的错误原因:
- 无论出于什么原因,对
NSDictionary
的演员都失败了 - 强行展开
data
失败。
不要使用!
强制解包服务器接收的数据,它可能是零。请改用以下代码:
guard let data = data, let jsonObj = try? JSONSerialization.jsonObject(with: data, options: .allowFragments) as? NSDictionary else { // Handle error here }
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